Added comment & resolve button to reply form

app/assets/javascripts/gl_form.js.coffee

...avascripts/line_comments/components/resolve_all.js.coffee

...sets/javascripts/line_comments/services/resolve.js.coffee

...ssets/javascripts/line_comments/stores/comments.js.coffee

app/assets/javascripts/notes.js.coffee

app/views/projects/merge_requests/_discussion.html.haml

app/views/projects/notes/_note.html.haml